• Standard:
  • Specification:
    Thickness: 6-420mm Width: 100-4200mm Length: 100-4200mm ... More
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    1 tons.We also can accept sample order.
  • Material:
    P235GH/P265GH/P355GH/16Mo3/13CrMo4-5/10CrMo9-10/12CrMo9-10P275N/P355N/P460N/A516/SA302/A387/A516 ... More
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GB/T1591 Q345B steel grade,Q345B low alloy structural steel
Steel Standard:GB/T1591
Rolling Type:High strength low alloy structural steels
Heat Treatment:As rolled/Control-rolled/Normalised
Steel grade Q345B is the most common used as high strength low alloy structural steel in industry area.BBN steel can offer steel coils,steel plates,angles,channels for Q345B materials.The equivalent steel grade with Q345B are EN 10025-2 S355JR,ASTM A572/A572 A572 Grade 50 and DIN 17100 St52-3.
Full Data
Technical Requirements & Additional Services:
♦ Low temperature impacting test
♦ Cutting and welding as per end user's demands
♦ More striction on some chemical elements contains
♦ Issued Orginal Mill test certificate under EN 10204 FORMAT 3.1/3.2
♦ Ultrasonic test under GB/T2970,JB4730,EN 10160,ASTM A435,A577,A578
Mechnical property for GB/T1591 Q345B low alloy structural steel:

Thickness (mm)
Q345B ≤ 16 > 16 ≤ 35 > 35 ≤ 50 >50
Yield strength (≥Mpa) 345 325 295 275
Tensile strength (Mpa) 470-630

Chemical composition for GB/T1591 Q345B low alloy structural steel (Heat Analysis Max%)

Main chemical elements composition of Q345B
C Si Mn P S V Nb Ti
0.20 0.55 1.00-1.60 0.040 0.040 0.02-0.15 0.015-0.060 0.02-0.20

Q345 steel specification: Q345 steel belongs to 16Mn steel grade, usually it is produced in hot rolled state, hot rolled steel plate, hot rolled steel coil/sheet, it has comprehensive mechanical and welding property, as it shows good performance in structural purposes, it is widely used as welding structural part in manufacturing of ship, railway and vehicles, bridges, boiler, pressure vessel container, steel oil tank, etc. Yield point of Q345 steel plate decreases as plate thickness increases.
Q345 steel properties: welding property of Q345 steel is occasionally questioned by end users, although welding property is mainly affected by its chemical content, its production technology has been improved after all those years of research, and has been proved to be one excellent steel standard for steel structure purposes, you can contact us if there's any doubt in your mind.
Application difference Q345 - Q235:
As Q345 and Q235 alloy element content is different, their applications are quite different.
Q235 carbon structural steel is made for metal construction that doesn't have high demand for steel strength, tie rod, connecting rod, hook, coupler, bolt and nut, sleeve, shaft and welding parts.
Q345 is low alloy structural steel with good mechanical properties, low temperature performance, plasticity and good weldability, it is mostly used in low pressure vessel, oil tank, vehicles, cranes, mining machinery, power stations, mechanical parts, building structure, general metal parts, Q345(E) steel plate is always delivered in hot rolled or normalizing state, can be used in areas where its temperature is above -40.
More about GB/T1591 Q345B steel grade,Q345B low alloy structural steel,contact

Steel processing product Applicaiton industries

Main Steel Grade: A36,SS400,S235JR,S355J2,S355JR,S355K2,S420N, S690Q,A283GRC, A572Gr70, A514GrF,A588GRA,A588GRB,S460Q,S690QL1,More Details, Kindly Check The Table As Follows.

Steel processing product applicaiton is widely,used in many industries.

Electric power field

Bridges and Construction steel structure

Auto parts

Pressure Vessels

Offshore operation equipment

Mechanical parts

Engineering machinery equipment

Steel Processing Equipmen

  • Heat treatment furnace

    Heat treatment furnace

  • Boring machine

    Boring machine

  • CNC milling machine

    CNC milling machine

  • Bending machine

    Bending machine

  • Plasma cutting machine

    Plasma cutting machine

  • Flame cutting machine

    Flame cutting machine

  • Press machine

    Press machine

  • Submerged arc welding machine

    Submerged arc welding machine

  • Surface grinder

    Surface grinder

  • 500T Punching machine

    500T Punching machine

OEM/ODM Service

OEM/ODM Service

Known as a large ODM enterprise, BBN steel can provide OEM and ODM service for different companies according to their demands. Our company will adopt advanced vertical machining center, and various advanced precision machining equipments, certified by ISO9001, ISO14001 and PED. Our machining steel products have been exported to many countries all over the world./p>

BBN Services

  • Technical evaluation

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  • Production Schedule

    Production Schedule

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  • Quality Control Team

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